I'm getting ready to set up a QT as I would like to start adding fish in the next 4 weeks or so. My QT will be a basic 10g tank with a biowheel filter and heater, no substrate just a couple of large PVC. If I will be using water from my Main Tank to fill it and I place the biowheel in my sump for a few days, how long will I need to give the QT to "cycle" before I can add a fish to it?